Shape.js

var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        if (typeof b !== "function" && b !== null)
            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var Shape = /** @class */ (function () {
    function Shape() {
    }
    ;
    return Shape;
}());
var Line = /** @class */ (function (_super) {
    __extends(Line, _super);
    function Line() {
        return _super.call(this) || this;
    }
    ;
    Line.prototype.draw = function () {
        console.log("Line");
    };
    ;
    return Line;
}(Shape));
var Circle = /** @class */ (function (_super) {
    __extends(Circle, _super);
    function Circle() {
        return _super.call(this) || this;
    }
    ;
    Circle.prototype.draw = function () {
        console.log("Circle");
    };
    ;
    return Circle;
}(Shape));
function myDraw(obj) {
    obj.draw();
}
var shapeObj = new Circle();
myDraw(shapeObj);